This is a power cable tidy wrap for those cheap ebay/China sourced photography/video light stands. Great for keeping the cables from tangling or tripping you up under foot when you put them away.

Clips onto the ~24mm grooved pole with a little pressure - not sure if this is a standard, but it may work on other stands using this style of grooved tubing too?

There's also a hook that can be used to hold the end of the power cord.